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Auto-Root achieved via Gavin's custom kernel for 5.1.1.
Still BETA but should work on 920 F / I / S / K / L / T / W8
Flash at your own risk on 5.1.1 only.
Odin or OTA to 5.1.1 first.
Then you need the current working TWRP from bigbiff he...

You'll have to format sd. Did you flash via kdz?
If so power off and power on with power + volume down. You will get to the LG factory reset option. Follow the instructions and it will do a reset and wipe the storage.
LG Optimus G E971/3/5

It's a feature of 5.1.1, do people not understand its a general android problem on 5.0.x, not just Samsung, and 5.1.1 on any device will fix those problems.
Ram management is S6 specific. Memory leak is Android 5.0 specific. The S6 has both....

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